Typewriter attachment



Fb. 13, 1945. ow

TYPEWRITER ATTACHMENT Original Filed March 14, 1940 F/yl INVENTOR RAYMOND DOW Patented Feb. 13, 1945 TYPEWRITER ATTACHMENT Raymond Dow, Flushing, N. Y.

Original application March 14, 1940, Serial No. 323,974. Divided and this application July 17, 1942, Serial No. 451,276

4 Claims.

This invention relates to improved means adapted to be applied to typewriters, adding machines, billing machines and the like, so as to in-' formthe operator when a portion of the sheet normally obscured from view is about to reach a predetermined position.

The invention has been illustrated as embodied in a typewriter attachment wherein it is particularly useful in informing the typist that the lower edge of the sheet is approaching a horizontal line of typing; the invention providing means for warning the operator not to continue the typing too close to the btotom edge of the sheet. When the invention is used in a typewriter to indicate that the lower edge of a sheet is approaching, the spacing between the attachment and the lower edge of the ribbon is such that a signal will be given when the lower edge of the sheet reaches a predetermined distance from the horizontal line being typed. I i This application is a division of application Se matured as PatentNo. 2,293,283, August 18, 1942.

The invention makes particular use of an opening in the paper guard through which the paper end springs to actuate a signal device to inform the operator that the lower edge ofthe paper is approaching the line of printing and that typing must cease if a uniform lower border is to be maintained on typed sheets.

The invention will be readily apparent from the following specification when read in connection with the accompanying drawing and will. be defined in particular as required by the statute in theappended claims; the drawing showing a preferred embodiment of the invention and in which:

Figure 1 represents in vertical cross sectional elevation so much of a typewriter. as will be necessary for a. complete understanding of the invention, and Q Figure 2 is a similarview showing certain of the parts in the position in which the lower end of a sheet is in the act of imparting motion to the signalling means.

Referring to the drawing in detail, It] is a conventional representation of part of the fixed frame of a typewriter in which operates the usual sliding carriage l l, carying a paper feed roll or platen l2, a guide plate I3 spaced from the platen and guide rolls [4 and I5 secured to arms 5 and H carried by a rod 3.

In the normal operation of a typewriter it is well known that as the lower end of the sheet approaches typing position opposite the ribbon l9 and the line of action of the type bars20, thesaid tirely hidden from view and difilculty is usually I i .rial No. 323,974 filed March 14, 1940 and which i end of the sheet is either partly obscured or enexperienced in determining when to remove the sheet, in order that the line typed near the bottom of the page will not come too close to the edge. I

According to the present invention, I provide in combination with a mechanism for moving the sheet, a means which is effective to operate a signal, so as to inform the operator when the lower edge of the sheet reaches a predetermined position or is approaching the line of action where the type faces strike the sheet.

In the embodiment of the invention, as illustrated, this means includes a pivotally mounted signal operating member 2| pivotally mounted as at 22 and having a finger 23 which in some cases may be provided with aroller, ball or spherical end 24 ridin on the sheet S and extending through an interrupted .portion 25 formed in the guide plate l3. The signal operating member includes a hammer 27, which is adapted to strike a bell 26 or to actuate any other suitable type of audible or visible signal. With such a mechanism, as the lower edge of the sheet approaches the line of typingor predetermined point, the

lower edge reaches the interrupted portion 25 and i the bell 26 whereupon the member 2| will return by gravity to the position of Figure 1.

It will be evident that while the invention has been illustrated as applied to a typewriter, it is also applicable to adding machines, cash registers or other devices of like nature.

While I have described quite specifically, one.

particular embodiment of the invention, it is to be understood that various modifications may be made without departing from the spirit of the invention or the scope of the appended claims.

What I claim is:

1. In combination with feed rollers and a sheet guide plate having an interrupted portion into which the end of the sheet is adapted to spring as it passes by, and a signal operating element extending into said interrupted portion and arranged to be actuated by the springing of the end of the sheet into said portion.

the end of the sheet is adapted to spring as it passes by, a signal and a pivoted operating member therefore having a finger extending into said interrupted portion and arranged to be tripped by the springing of the end of the sheet into said portion.

'3. In combination with the feed platen, the guide plate of a typewriter and asheet feed between them,;an operating member. havihgaa finger a recessed portion into which the end of the sheet is adapted to spring and thus quickly strike and move the finger and a signal actuated by the-movement of the finger.

"springing movement of the end of the sheet as it reaches said opening teammate a signafl means. which fid'esbfl the sheet said guide piate having 10 j 

